CVE-2020-28915 json
A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read…
published 2020-11-18 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-21306
- cvss
- 5.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read kernel memory, aka CID-6735b4632def.
Patch / fix
- linux linux_kernel 5.8.15
- linux Debian 14, Debian 13, Debian 12 5.9.1-1
debian advisories DEBIAN-CVE-2020-28915
- linux Ubuntu 16.04 LTS 4.4.0-197.229
- linux Ubuntu 18.04 LTS 4.15.0-126.129
- linux Ubuntu 20.04 LTS 5.4.0-56.62
- linux-aws Ubuntu 16.04 LTS 4.4.0-1118.132
- linux-aws Ubuntu 18.04 LTS 4.15.0-1088.93
- linux-aws Ubuntu 20.04 LTS 5.4.0-1030.31
- linux-gcp Ubuntu 16.04 LTS 4.15.0-1088.101~16.04.1
- linux-gcp Ubuntu 20.04 LTS 5.4.0-1030.32
ubuntu advisories UBUNTU-CVE-2020-28915
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel RHEL 8 4.18.0-372.13.1.el8_6
- perf rhev hypervisor 4.4, RHEL 8 4.18.0-372.13.1.el8_6
- bpftool RHEL 8 4.18.0-372.13.1.el8_6
- kernel-core RHEL 8 4.18.0-372.13.1.el8_6
- kernel-tools RHEL 8 4.18.0-372.13.1.el8_6
- python3-perf RHEL 8 4.18.0-372.13.1.el8_6
- kernel-modules RHEL 8 4.18.0-372.13.1.el8_6
- kernel-zfcpdump RHEL 8 4.18.0-372.13.1.el8_6
red hat advisories RHSA-2022:5316RHSA-2022:5344
- kernel-syms SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.138.1
- kernel-source SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.138.1
- kernel-default SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +5 more 4.4.180-94.138.1
- kgraft-patch-SLE12-SP3_Update_37 SLES for SAP 12 SP3, SLES 12 SP3-LTSS, OpenStack Cloud Crowbar 8 +3 more 1-4.3.1
- kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.66.1
- kernel-source SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.66.1
- kernel-default SLES for SAP 15, SLES 15-LTSS, SLE Live Patching 15 +3 more 4.12.14-150.66.1
- kernel-vanilla SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.66.1
suse advisories SUSE-SU-2021:14630-1SUSE-SU-2021:0452-1SUSE-SU-2021:0438-1SUSE-SU-2021:0437-1SUSE-SU-2021:0434-1SUSE-SU-2020:3798-1
- kernel-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
- kernel-syms-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
- kernel-rt_debug openSUSE Leap 15.2 5.3.18-lp152.3.5.1
- kernel-source-rt openSUSE Leap 15.2 5.3.18-lp152.3.5.1
- kernel-default-base openSUSE Leap 15.2 5.3.18-lp152.57.1.lp152.8.17.1
- kernel-syms openSUSE Leap 15.2 5.3.18-lp152.54.1
- kernel-obs-qa openSUSE Leap 15.2 5.3.18-lp152.54.1
- kernel-source openSUSE Leap 15.2 5.3.18-lp152.54.1
opensuse advisories openSUSE-SU-2021:0242-1openSUSE-SU-2020:2260-1openSUSE-SU-2020:2161-1openSUSE-SU-2020:2034-1
- kernel AlmaLinux 8 4.18.0-372.13.1.el8_6
- perf AlmaLinux 8 4.18.0-372.13.1.el8_6
- bpftool AlmaLinux 8 4.18.0-372.13.1.el8_6
- kernel-core AlmaLinux 8 4.18.0-372.13.1.el8_6
- kernel-tools AlmaLinux 8 4.18.0-372.13.1.el8_6
- python3-perf AlmaLinux 8 4.18.0-372.13.1.el8_6
- kernel-modules AlmaLinux 8 4.18.0-372.13.1.el8_6
- kernel-debug-core AlmaLinux 8 4.18.0-372.13.1.el8_6
almalinux advisories ALSA-2022:5316ALSA-2022:5344
- kernel-rt Rocky Linux 8 4.18.0-372.13.1.rt7.170.el8_6
- kernel Rocky Linux 8 4.18.0-372.13.1.el8_6
rocky linux advisories RLSA-2022:5344RLSA-2022:5316
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-28915 updated cvss 5.8
kernel: out-of-bounds read in fbcon_get_font function
-
Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 moreaffected: workaround, no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmwareaffected: workaround, no fix planned “Will not fix”
-
Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-372.13.1.el8_6, kernel 4.18.0-372.13.1.el8_6, bpftool 4.18.0-372.13.1.el8_6, kernel-core 4.18.0-372.13.1.el8_6, kernel-tools 4.18.0-372.13.1.el8_6, python3-perf 4.18.0-372.13.1.el8_6, +15 more Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-372.13.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.13.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.13.1.el8_6fixed: vendor fix RHSA-2022:5316
-
Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-kvm 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-core 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-modules 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-debug-kvm 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-debug-core 4.18.0-372.13.1.rt7.170.el8_6, +4 more Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-core 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-modules 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-debug-core 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-debug-modules 4.18.0-372.13.1.rt7.170.el8_6, kernel-rt-modules-extra 4.18.0-372.13.1.rt7.170.el8_6, +2 morefixed: vendor fix RHSA-2022:5344
-
Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.13.1.el8_6, kernel-debuginfo-common-x86_64 4.18.0-372.13.1.el8_6fixed: vendor fix RHSA-2022:5316
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.8 | CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H |
| NVD | 2.0 | 6.1 | AV:L/AC:L/Au:N/C:P/I:P/A:C |
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
- Technology feeds
References
-
git.kernel.org
/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6735b4632def0640dbdf4eb9f99816aca18c4f16
patch, vendor-advisory
-
git.kernel.org
/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5af08640795b2b9a940c9266c0260455377ae262
patch, vendor-advisory
-
syzkaller.appspot.com
/bug?id=08b8be45afea11888776f897895aef9ad1c3ecfd
patch, third-party-advisory
-
cdn.kernel.org
/pub/linux/kernel/v5.x/ChangeLog-5.8.15
release-notes, vendor-advisory
-
bugzilla.suse.com
/show_bug.cgi?id=1178886
issue-tracking, third-party-advisory
Sources
- CVE List CVE-2020-28915
- NVD CVE-2020-28915
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.